Support of the plugin builders;
First, i would check if you have the newest version of the theme. If yes, and it still doesn’t work, you should ask the theme support. Maybe you can send them the following explanation, this should help them to find out what’s going wrong, and if they think we should fix something on our side or if they have questions about it, let me know.
Basically the problem is that when this theme is active, the images uploaded through plugin picu don’t get „attached“ (post_parent not set) to the post (collection) anymore, as they normally do. We in picu use this information to filter the images in the media library, and that’s why they show up in your case.

My apologies for the very delayed reply. I personally tested this and I do see the issue now.

Images uploaded via picu appears on the Media Library (which shouldn’t since you implemented filters) and images uploaded using another theme do not appear on the Media Library which is the supposed correct behavior.